What temperature was he acclimated to?

Our Church had a picnic this last SEP, and the temperature dropped from in the 80s to the lower 60s. It wasn't actually cold out, but we all felt cold because of the drop in temperature.

Similarly, I've worn a winter coat in a room air conditioned into the 80s when the outside temperature was in the 100s, and had snowball fights in bare feet after winter weather had been around for a while.

Just wondering if acclimization was a factor. Thank you; this has been very informative and interesting.